package com.atguigu.springcloud.alibaba.controller;

import com.atguigu.springcloud.alibaba.Ib.LoadBalancer;
import com.atguigu.springcloud.alibaba.entities.CommonResult;
import com.atguigu.springcloud.alibaba.entities.Payment;
import lombok.extern.slf4j.Slf4j;
import org.springframework.cloud.client.ServiceInstance;
import org.springframework.cloud.client.discovery.DiscoveryClient;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;

import javax.annotation.Resource;
import java.net.URI;
import java.util.List;

@RestController
@Slf4j
public class OrderController {

//    public static final String PAYMENT_URL = "http://localhost:8001";单机版
    public static final String PAYMENT_URL = "http://CLOUD-PAYMENT-SERVICE";

    @Resource
    private RestTemplate restTemplate;

    @Resource
    private LoadBalancer loadBalancer;

    @Resource
    private DiscoveryClient discoveryClient;

    @PostMapping("/consumer/payment/create")
    public CommonResult<Payment> create(Payment payment){
//        return restTemplate.postForObject(PAYMENT_URL+"/payment/create",payment,CommonResult.class);
        // Ribbon 负载均衡
        return restTemplate.postForEntity(PAYMENT_URL+"/payment/create",payment,CommonResult.class).getBody();
    }

    // 返回对象为响应体中数据转化成的对象，基本上可以理解为Json (推荐使用这个 RestTemplate)
    @GetMapping("/consumer/payment/get/{id}")
    public CommonResult<Payment> getPayment(@PathVariable("id") Long id){
        return restTemplate.getForObject(PAYMENT_URL+"/payment/get/"+id,CommonResult.class);
    }

    // 返回对象为ResponseEntity对象，包含了响应中的一些重要信息，比如响应头、响应状态码、响应体等
    @GetMapping("/consumer/payment/getForEntity/{id}")
    public CommonResult<Payment> getForEntity(@PathVariable("id") Long id){
        ResponseEntity<CommonResult> entity = restTemplate.getForEntity(PAYMENT_URL + "/payment/get/" + id, CommonResult.class);
        // 2xx 如果成功
        if (entity.getStatusCode().is2xxSuccessful()){
            log.info(entity.getStatusCode() + "\t" + entity.getStatusCodeValue());
            return entity.getBody();
        } else {
            return new CommonResult<>(444,"操作失败");
        }
    }

    @GetMapping(value = "/consumer/payment/lb")
    public String getPaymentLB(){

        List<ServiceInstance> instances = discoveryClient.getInstances("CLOUD-PAYMENT-SERVICE");
        if (instances == null || instances.size() <= 0){
            return null;
        }
        ServiceInstance serviceInstance = loadBalancer.instances(instances);
        URI uri = serviceInstance.getUri();

        return restTemplate.getForObject(uri + "/payment/lb" , String.class);
    }

    // ==========》zipkin+sleuth
    @GetMapping("/consumer/payment/zipkin")
    public String paymentZipkin(){
        String result = restTemplate.getForObject("http://localhost:8001" + "/payment/zipkin/" , String.class);
        return result;
    }


}
